This mixed-methods longitudinal study investigated the academic, sociocultural, and psychological adjustment trajectories of international students undertaking one-year postgraduate degrees in the humanities and social sciences at a single British university. It also sought to re-examine the applicability of 'U-curve' hypothesis. Three waves of self-report questionnaires (N = 120, 108, 102) measured international students' adjustment satisfaction and their adjustment patterns throughout nine months period. Additionally, three rounds of semi-structured interviews (N = 16) were conducted to explore students' lived experiences and adjustment trajectories over time. The findings revealed complex adjustment patterns that differed across academic, sociocultural, and psychological domains. Enablers and barriers to adjustment, as perceived by the students, included cultural distance, English language ability, academic workload, previous personal experiences, and university support. The study contributes to the theoretical understanding of international students' adjustment, provides insights into the experiences of student sojourners in the UK higher education context and increases knowledge regarding student support services.